Natural Whey Protein Isolate (WPI)
Our Natural Whey Protein Isolate (WPI) has been reformulated to deliver a cleaner, smoother taste while keeping the same premium quality you expect from Bulk Nutrients.
Sourced from grass-fed, hormone-free cows, Natural WPI is one of the purest whey proteins available, with virtually no lactose, low fat and carbs, and over 81% protein content per serve. It’s the perfect post-workout recovery shake or a high-protein boost anytime you need it.
Product Description
All Natural Ingredients, GMO-Free
Our Natural Whey Protein Isolate (WPI) is one of the cleanest, purest whey proteins available, now with a whey better taste.
Made with 100% natural ingredients, it delivers high-quality protein with zero artificial additives.
Milk from Grass-Fed, Hormone-Free Cows
Sourced from grass-fed, hormone-free cows, our Natural WPI undergoes cross-flow microfiltration to retain maximum purity while keeping fats and carbs at an absolute minimum.
With virtually no lactose, this ultra-lean protein is ideal for those looking for high-protein, low-carb nutrition to support muscle recovery and lean muscle growth.
Naturally Sweetened for a Smoother, Cleaner Taste
We’ve upgraded our natural sweetener blend to stevia + thaumatin, delivering a clean, smooth sweetness with no bitterness or overpowering aftertaste.
Muscle Recovery & Performance
With over 81% protein per serve, Natural WPI is packed with branched-chain and essential amino acids (BCAAs & EAAs), making it ideal for muscle repair, recovery, and growth.
Whether you’re an athlete, gym-goer, or just looking to increase your protein intake, Natural WPI provides fast-digesting, high-quality protein to fuel your body.
WPI for Lean Muscle & Weight Management
Due to its high protein content and ultra-low fat & carb profile, Natural WPI is perfect for those on high-protein diets, low-carb plans, or anyone looking for a clean protein source.
Directions / Ingredients
Serving Size
Consume 30g (approximately 1 heaped scoop) of Natural WPI after training.
Directions for Natural Whey Protein Isolate
Combine powder with 300-400ml of liquid and consume immediately.
Natural WPI is amazing in recipes or with fresh fruit in smoothies.
Ingredients
Chocolate flavour
Whey Protein Isolate (Milk) (Emulsifier (Sunflower Lecithin)), Natural Flavours, Natural Sweetener (Stevia, Thaumatin). Note: Chocolate contain cocoa.
Contains: Milk.
Vanilla flavour
Whey Protein Isolate (Milk) (Emulsifier (Sunflower Lecithin)), Natural Flavours, Natural Sweetener (Stevia, Thaumatin).
Contains: Milk.
Salted Caramel
Whey Protein Isolate (Milk) (Emulsifier (Sunflower Lecithin)), Natural Flavours, Natural Sweetener (Stevia, Thaumatin). Note: Salted Caramel contains salt.
Contains: Milk.
Storage
Keep package well sealed, store away from moisture, light and heat.
Further Reading
Product FAQs
How does Natural Whey Protein Isolate taste?
Natural Whey Protein Isolate is considered to have a pleasant taste. Natural/raw is generally considered to have a neutral taste.
What is Natural Whey Protein Isolate made from?
Natural Whey Protein Isolate is a protein derived from milk.
How is Natural Whey Protein Isolate packaged?
Natural Whey Protein Isolate is packaged in resealable 1kg pouches.
Is the packaging for Natural Whey Protein Isolate recyclable?
In theory yes, but not in all council areas right now.
The REDcycle program has been discontinued, and the industry is working together to find a solution to continue recycling soft plastics. For now, we recommend checking with your local council, but most require you to put the packaging in your regular landfill bin.
The included scoop can be recycled as hard plastic in your local council pickup.
For more information about what Bulk is doing to improve sustainability, check this article.
Can I receive a discount buying more than one of this product at once?
Absolutely! Price breaks for Natural Whey Protein Isolate begin when you purchase 2 units of any flavour. Just add more than that to your cart to see the savings.
Does Bulk do a 'normal' version of WPI?
We absolutely do! Bulk Nutrients’ Whey Protein Isolate comes in a great range of flavours sure to tickle your tastebuds. Similarly to our Natural WPI, we source our WPI from grass-fed, hormone free cows. It has high levels of protein and lower levels of fats, carbohydrates and sodium – and our WPI comes in a great range of permanent flavours, as well as a raw option and the occasional limited edition flavour!
Does Bulk do a WPI safe for use in tested sports?
Our HASTA WPI range in both Vanilla and Chocolate flavours are safe to be used by natural athletes and competitors in tested sports. Batches are regularly sent for testing to ensure they don’t contain any ingredients that are banned by SIA (Sports Integrity Australia) or WADA – the World Anti-Doping Agency.
Lab Results
At Bulk Nutrients we take our products’ purity very seriously.
To maintain our Natural WPI’s consistent high quality, we send a cross-section of our product range to certified Australian laboratories for testing, such as National Measurement Institute (NMI), Southern Cross University, ARL and Scientest which are all independently verified and NATA/TGA accredited.
The NMI is a laboratory run by the Australian Government, which is used for police forensic testing, SIA - Sports Integrity Australia drug screening and by multinational food manufacturers for quality and safety testing.
NMI has conducted many hundreds of tests on Bulk Nutrients products for more than 10+ years.
Lab testing results for Natural WPI
- 25/06/2026 - Natural WPI - Salted Caramel
- 16/03/2026 - Natural WPI - Vanilla
- 09/07/2025 - Natural WPI - Chocolate
- 13/02/2025 - Natural WPI - Vanilla
- 17/02/2023 - Natural WPI - Chocolate
- 18/07/2022 - Natural WPI - Vanilla
- 16/02/2022 - Natural WPI - Chocolate
- 16/02/2022 - Natural WPI - Vanilla
- 15/02/2021 - Natural WPI - Chocolate
- 15/02/2021 - Natural WPI - Vanilla
- 13/08/2020 - Natural WPI - Chocolate
- 13/08/2020 - Natural WPI - Vanilla
- 13/05/2020 - Natural WPI - Chocolate
- 13/05/2020 - Natural WPI - Vanilla
- 18/09/2019 - Natural WPI - Chocolate
- 18/09/2019 - Natural WPI - Vanilla
- 31/07/2015 - Natural WPI - Raw (Unflavoured)
Recipes
The Recipe Section of the Bulk Nutrients Blog now has over 300 healthy recipes.
Here are some of our favourites that use Natural Whey Protein Isolate:
Nutrition Panels
| CHOCOLATE NATURAL WPI NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Energy (kj) | 466 | 1,554 |
| Protein (g) | 24.4 | 81.2 |
| Fats (g) | 0.5 | 1.5 |
| (saturated) (g) | 0.1 | 0.3 |
| Carbohydrates (g) | 2.4 | 7.9 |
| (sugars) (g) | 0.8 | 2.7 |
| Fibre (g) | 0.1 | 0.5 |
| Sodium (mg) | 78 | 259 |
| VANILLA NATURAL WPI NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Energy (kj) | 466 | 1,552 |
| Protein (g) | 25.3 | 84.2 |
| Fats (g) | 0.3 | 1.0 |
| (saturated) (g) | 0.1 | 0.2 |
| Carbohydrates (g) | 1.9 | 6.3 |
| (sugars) (g) | 0.9 | 2.9 |
| Fibre (g) | 0.0 | 0.1 |
| Sodium (mg) | 76 | 252 |
| SALTED CARAMEL NATURAL WPI NUTRITION INFORMATION | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Energy (kj) | 464 | 1,546 |
| Protein (g) | 25.1 | 83.5 |
| Fats (g) | 0.3 | 1.0 |
| (saturated) (g) | 0.1 | 0.2 |
| Carbohydrates (g) | 2.0 | 6.7 |
| (sugars) (g) | 0.9 | 2.9 |
| Fibre (g) | 0.0 | 0.1 |
| Sodium (mg) | 122 | 406 |
| TYPICAL NATURAL WPI AMINO ACID PROFILE | ||
|---|---|---|
| Servings per 1kg package: 33Servings size: 30g | ||
| Average Quantity Per Serving | Average Quantity Per 100g | |
| Alanine (mg) | 1,379 | 4,597 |
| Arginine (mg) | 726 | 2,420 |
| Aspartic Acid (mg) | 3,023 | 10,077 |
| Cysteine (mg) | 967 | 3,223 |
| Glutamic Acid (mg) | 4,257 | 14,190 |
| Glycine (mg) | 435 | 1,450 |
| Histidine (mg) | 484 | 1,613 |
| Isoleucine (mg) | 1,524 | 5,080 |
| Leucine (mg) | 3,459 | 11,530 |
| Lysine (mg) | 2,709 | 9,030 |
| Methionine (mg) | 580 | 1,933 |
| Phenylalanine (mg) | 919 | 3,063 |
| Proline (mg) | 1,088 | 3,627 |
| Serine (mg) | 1,088 | 3,627 |
| Threonine (mg) | 1,282 | 4,273 |
| Tryptophan (mg) | 580 | 1,933 |
| Tyrosine (mg) | 1,016 | 3,387 |
| Valine (mg) | 1,354 | 4,513 |
Reviews
to see which products you can review.
What Our Customers Are Saying
Customers commonly praise Natural WPI for its enjoyable flavour, smooth texture, easy mixing and use of stevia rather than sucralose. Many value its simple ingredient profile, protein content, affordability and versatility in shakes, coffee, oats and recipes. Several describe the sweetness as balanced, although a small number find it too sweet or notice a stevia aftertaste. Reviewers also request more flavours and clearer country-of-origin labelling.
Natural Whey Protein Isolate
4.79 from 544
Product Overview
Sourced from grass fed, 100% hormone free cows makes Bulk Nutrients' Natural WPI one of the cleanest and purest whey protein options available.
Taste
Mixability
Effectiveness
Value for Money
Lactose Free
Gluten Free Ingredients
Vegetarian
Vegan
Rewards & Easy Instalments
Point Rewards
or register an account to earn 240 points when you purchase Natural WPI.
When you reach the Bronze tier, you'll earn 320 points, at the Silver tier earn 400, and 480 points on the Gold Tier. Find out more.
Pay in 4 Payments
For bigger orders over $100 AUD, choose to pay with AfterPay or PayPal Pay in 4. Find out more.
Availability & Shipping
Flat rate $9 shipping Australia-wide. Orders up to 3.5kg ship Express Post, over 3.5kg ship Parcel Post.
Multibuy Discounts
Save on Natural WPI with multibuy discounts. Add 2 or more bags of any flavour to your cart and start saving.
Price Per Bag
- 1kg = $80.00
- 2kg (2 x 1kg) bags = $79.00 each
- 3kg (3 x 1kg) bags = $78.00 each
- 4kg (4 x 1kg) bags = $77.00 each
- 5kg (5 x 1kg) bags = $75.00 each